[PATCH v3] cpukit: Prevent error with disabled stack checker

[Sebastian Huber]

On 27/01/2022 16:59, Kinsey Moore wrote:
> When the stack checker is not enabled, the stack checker reporting
> function can still be called. This prevents that call from performing a
> null memory access in trying to find the high water mark if the stack
> checker was never initialized.
> 
> This also introduces a test to ensure this call does not cause a crash.
> 
> Closes #4588

Thanks, looks good.

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